LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Christoph Lameter <clameter@sgi.com>
To: Nick Piggin <npiggin@suse.de>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Linux Memory Management List <linux-mm@kvack.org>
Subject: Re: [patch] mm: NUMA replicated pagecache
Date: Wed, 14 Feb 2007 10:57:00 -0800 (PST)	[thread overview]
Message-ID: <Pine.LNX.4.64.0702141052350.975@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <20070213060924.GB20644@wotan.suse.de>

On Tue, 13 Feb 2007, Nick Piggin wrote:

> Just tinkering around with this and got something working, so I'll see
> if anyone else wants to try it.
> 
> Not proposing for inclusion, but I'd be interested in comments or results.

We would be very interested in such a feature. We have another hack that 
shows up to 40% performance improvements.

> At the moment the code is a bit ugly, but it won't take much to make it a
> completely standalone ~400 line module with just a handful of hooks into
> the core mm. So if anyone really wants it, it could be quite realistic to
> get into an includable form.

Would be great but I am a bit skeptical regarding the locking and the 
additonal overhead moving back and forth between replications and non 
replicated page state.

> At some point I did take a look at Dave Hansen's page replication patch for
> ideas, but didn't get far because he was doing a per-inode scheme and I was
> doing per-page. No judgments on which approach is better, but I feel this
> per-page patch is quite neat.

Definitely looks better.

> - Would be nice to transfer master on reclaim. This should be quite easy,
>   must transfer relevant flags, and only if !PagePrivate (which reclaim
>   takes care of).

Transfer master? Meaning you need to remove the replicated pages? Removing 
of replicated pages should transfer reference bit?

> - Should go nicely with lockless pagecache, but haven't merged them yet.

When is that going to happen? Soon I hope?

  parent reply	other threads:[~2007-02-14 18:57 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-13  6:09 Nick Piggin
2007-02-13  6:09 ` Nick Piggin
2007-02-14  4:28 ` Nick Piggin
2007-02-14 18:57 ` Christoph Lameter [this message]
2007-02-15  0:07   ` Nick Piggin
2007-02-14 19:00 ` Christoph Lameter
2007-02-15  0:10   ` Nick Piggin
2007-02-15  0:13     ` Christoph Lameter
2007-02-14 20:32 ` Lee Schermerhorn
2007-02-15  0:38   ` Nick Piggin
2007-02-15 23:29     ` Lee Schermerhorn
2007-02-16 13:35       ` Nick Piggin

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=Pine.LNX.4.64.0702141052350.975@schroedinger.engr.sgi.com \
    --to=clameter@sgi.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=npiggin@suse.de \
    --subject='Re: [patch] mm: NUMA replicated pagecache' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).